Abstract
Objective To evaluate the utility of auditory steady-state responses (ASSRs) to narrow-band chirps (NB-chirps) for estimating hearing levels in children. Design Thresholds from the NB-chirp ASSR were evaluated in 30 sedated children with normal hearing or hearing loss. The correlation between the NB-chirp ASSR and pure-tone audiometry (PTA) thresholds was analyzed, and the difference score (DS) between these thresholds was calculated. Data from the NB-chirp ASSR were compared to retrospective data from conventional ASSR to exponentially amplitude-modulated tones in 25 sedated children. Results Positive correlations between the NB-chirp ASSR and PTA thresholds were found at 500, 1000, 2000, and 4000 Hz. Multiple comparisons of the DSs for the NB-chirp ASSR and PTA revealed significant differences at 500-2000 Hz and 4000 Hz, as well as 1000-2000 Hz and 4000 Hz. Comparisons of the DSs demonstrated that the DS of the NB-chirp ASSR was significantly smaller than that of the conventional ASSR at 2000 Hz. Furthermore, the testing times for the NB-chirp ASSR were significantly shorter than those for the conventional ASSR. Conclusion The NB-chirp ASSR closely reflected the PTA thresholds, and the testing time was shorter than that of the conventional ASSR. Thus, this study demonstrated that the NB-chirp ASSR is useful for hearing threshold estimation in children.
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